BRIEF HISTORY - From the brochure.....
A huge iron-nickle meteorite, estimated to have been about 150 feet across and weighing several hundred thousand tons, struck the rocky plain with an explosive force greater than 20 million tons of TNT. The result was the excavation of a giant bowl-shaped cavity. In less than a few seconds, a crater 700 feet deep and over 4000 feet across (2.4 miles in circumference) was carved into this once-flat rocky plain. The floor of the crater is 550 feet deep, equivalent to a 60 story building. If the Washington Monument were placed on the floor of the crater, its top would be at eye level.
